http://www.bestmp3playerearbuds.com/dynamic-headphone/
Why do high quality headphones have frequency ranges well above human hearing range?
I mean, human frequency recognition is approximately 20-20,000 Hz, yet some higher quality headphones have a dynamic frequency range of like 6 to 30 or 40 or even 50,000 Hz. Why?
Because of what is called roll off this helps to more accurately reproduce
the 20Hz to 20Khz which is the normal range of the average human ear.
In the industry we call it air.
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